An illumination apparatus for lighting a road surface includes a light source mounted on the road surface, an electrical power storage device, a solar cell, and a transparent package. The light source includes at least one light emitting diode and an optical element optically coupled to the light emitting diode. The optical element deflects the light from the light emitting diode to opposite sides of the light source along the road surface. The included angles between the light from the optical element and the road surface are asymmetric at the opposite sides of the light source. The light source and the solar cell are encapsulated in the transparent packing.
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1. An illumination apparatus for lightening a road surface comprising:
a light source configured for being mounted on the road surface, comprising at least one light emitting element and an optical element, wherein the light from the at least one light emitting element passes through the optical element and deflects to opposite sides of the light source, the light is emitted along an extension axis of the road surface asymmetrically distributed on the opposite sides of the light source along the extension axis of the road surface;
an electrical power storage device, electrically connecting with the at least one light emitting element;
a solar cell, electrically connecting with the electrical power storage device to convert sunlight into electricity stored in the electrical power storage device; and
a transparent package, which encapsulates the light source and the solar cell therein;
wherein the transparent package is a truncated cone-shape with a top surface and a side surface surrounding the top surface, the light source is mounted on the bottom of the transparent package and the solar cell is mounted on the top portion of the transparent package near the top surface of the transparent package.
11. An illumination apparatus for lightening a road surface comprising:
a light source configured for being mounted on the road surface, comprising at least one light emitting element and an optical element, wherein the light from the at least one light emitting element passes through the optical element and deflects to opposite sides of the light source, the light is emitted along an extension axis of the road surface asymmetrically distributed on the opposite sides of the light source along the extension axis of the road surface;
an electrical power storage device, electrically connecting with the at least one light emitting element;
a solar cell, electrically connecting with the electrical power storage device to convert sunlight into electricity stored in the electrical power storage device; and
a transparent package, which encapsulates the light source and the solar cell therein;
wherein the transparent package has a circular top and the solar cell is mounted in the circular top; and
wherein the optical element includes a funnel-shaped top surface and two vertical sidewalls of different heights, wherein the top surface is totally reflective, and the at least one light emitting element is mounted on the center of the bottom of the optical element and opposite to the top surface.
12. An illumination apparatus for lightening a road surface comprising:
a light source configured for being mounted on the road surface, comprising at least one light emitting element and an optical element, wherein the light from the at least one light emitting element passes through the optical element and deflects to opposite sides of the light source, the light is emitted along an extension axis of the road surface asymmetrically distributed on the opposite sides of the light source along the extension axis of the road surface;
an electrical power storage device, electrically connecting with the at least one light emitting element;
a solar cell, electrically connecting with the electrical power storage device to convert sunlight into electricity stored in the electrical power storage device; and
a transparent package, which encapsulates the light source and the solar cell therein;
wherein the transparent package has a circular top and the solar cell is mounted in the circular top; and
wherein the optical element includes a funnel-shaped top surface and two sidewalls of different heights, the top surface is a curved surface comprising a plurality of different-angled planes, the at least one light emitting element is mounted on the center of bottom of the optical element and opposite the top surface, wherein the top surface provides a total reflection of the light and each of the sidewalls has a smooth curved surface.
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1. Technical Field
The disclosure relates to illumination, and particularly to an illumination apparatus providing glare prevention.
2. Description of the Related Art
Light emitting diodes' (LEDs) many advantages, such as high luminosity, low operational voltage, low power consumption, compatibility with integrated circuits, easy driving, long term reliability, and environmental friendliness have promoted their wide use as a light source.
Joseph Bielecki et al in IEEE, 23rd IEEE SEMI-THERM Symposium, “Thermal Considerations for LED Components in an Automotive Lamp.” characterize light emitting diodes as one kind of semiconductor device changing current into light of specific wavelength.
Glare, or unwanted occurrence of bright light, can be direct, where the light is emitted from high luminance or glare source and directly on viewers, with the glare source in the same direction or aligned with the observed object, or indirect, where the glare source is not in the direction of observation, and is usually caused by light reflected from a smooth surface. Referring to
Currently, many street light illumination apparatus can create direct glare to drivers. Referring to
Referring to
What is needed therefore, is an illumination apparatus with glare prevention overcoming the described limitations.
Many aspects of the present illumination apparatus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present illumination device. Moreover, in the drawing, like reference numerals designate corresponding parts throughout the several views.
Embodiments of the illumination apparatus are described in detail here with reference to the drawings.
Referring to
The light emitting element 121 can be an LED (light emitting diode), laser, organic light emitting diode, or light emitting diode modules. The road aligns along axis X.
Light from the light emitting element 121 passes through the optical element 122, and is emitted with optical effect. In this embodiment, the light source 12 is mounted on a road surface 11, and the light emitting element 121 emits light upwardly into the optical element 122. The optical element 122 deflects the light from the light emitting element 121 to the side of the light source 12, and then along axis X of the road surface 11.
The optical element 122 has a vertical axis 1220 perpendicular to the extension of axis X of the road surface 11. The extension of axis X of the road surface 11 is divided into axis +X and axis −X. The optical element 122 includes funnel-shaped top surfaces 1221 and 1222, and vertical sidewalls 1223 and 1224. The light emitting element 121 is mounted on the geometric center of the bottom of the optical element 122. The light emitting element 121 is opposite to the top surfaces 1221 and 1222. The top surfaces 1221 and 1222 are quadric surfaces. In this embodiment, the top surfaces 1221 and 1222 of the optical element 122 are parabolic surfaces. The angle of the top surface 1221 is less than the angle of the top surface 1222. The inner surfaces of the top surfaces 1221 and 1222 are reflective. The height of the vertical sidewall 1224 relative to the road surface 11 is higher than the height of the vertical sidewall 1223.
Electrical power storage device 13, such as a battery, is electrically connected to the light emitting element 121.
The transparent package 15 is mounted on the road surface 11, with the light source 12 and the solar cell 14 encapsulated therein. In this embodiment, the transparent package 15 is a truncated cone having a top surface 151 and a side surface 152 surrounding the top surface 151. The light source 12 is in the bottom of the transparent package 15. The solar cell 14 is mounted on top of the transparent package 15 relative to the light source 12 and is adjacent to the top surface 151. The solar cell 14 can directly absorb sunlight.
In this embodiment, the light is emitted from light emitting element 121 to the top surface 1221, experiences total reflection therefrom, and then passes through the vertical sidewall 1223 to the side surface 152 of the transparent package 15, is refracted at the sidewall 152 and provided to the road surface 11. The included angle between light incident on the road surface 11 and the axis −X of the road surface 11 is θ1. The light from the light emitting element 121 is emitted to the top surface 1222, and experiences total reflection at the top surface 1222, and then passes through the vertical sidewall 1224, and is emitted to the sidewall 152 of the transparent package 15, and experiences refraction at the sidewall 152, before being emitted to the road surface 11. The included angle between the light emitted to the road surface 11 and the axis +X of the road surface 11 is θ2. The vertical sidewall 1224 of the optical element 122 is higher than that of the vertical sidewall 1223. Accordingly, light from the light emitting element 121 passes through the optical element 122 and the transparent package 15 and is emitted along road surface 11, and the distribution of the optical field of both sides of the light source 12 is asymmetric. Thus, θ1 is less than θ2. Therefore, the light from the illumination apparatus 100 is not directly incident upon viewers moving along axis −X from left of
Referring to
The optical element 122 of the light source 12 can alternatively take other structures which are asymmetrical, not being limited to that of this embodiment. Thus, the included angle θ between light from the light source 12 and the road surface 11 is in the predetermined range, and the distribution of the light at both sides of the road surface 11 is asymmetrical. Following are several exemplary light sources with different optical elements.
Referring to
The light from the light emitting element 321 is emitted to the first top surface 3221 and the second top surface 3222, and experiences total reflection at the first top surface 3221 and the second top surface 3222, wherein the light emitted is nearly perpendicular to the vertical axis 3220.
In other words, a major part of the light from the light emitting element 321 is emitted toward the first side surface 3223 and the second side surface 3224 and at an angle nearly of 90° with the vertical axis 3220.
Most of the light passing through the first side surface 3223 of the optical element 322 is parallel to the extension axis −X of the road surface 11, wherein the included angle between the light from the optical element 322 having 50% of the maximum luminous intensity and the road surface 11 is θ1.
Most of the light passing through the second side surface 3224 of the optical element 322 is parallel to the extension axis +X of the road surface 11, wherein the included angle between the light from the optical element 322 having 50% of the maximum luminous intensity and the road surface 11 is θ2.
Since the first side surface 3223 of the optical device 322 relative to the road surface 11 is shorter than the second side surface 3224, the light from the light emitting element 321 passing through the optical element 322 is emitted with the optical field distribution of both sides of the light source 32 along the road surface 11 asymmetrically. The included angles θ1 and θ2 are between the light from the light emitting element 321 passing through the optical element 322 and the road surface 11. θ1 is less than θ2. θ1 and θ2 are within the predetermined range, such as −10°<θ1<+10° and −20°<θ2<+20°. The included angles θ1 and θ2 are between the light from optical element 322 having 50% of the maximum luminous intensity on the plane and the road surface 11. Furthermore, a reflector 3225 can be mounted on the first top surface 3221 of the optical element 322 and a reflector 3226 on the second top surface 3222 of the optical element 322 to increase reflection efficiency.
Referring to
The light from the light emitting element 421 passes through the bottom surface of the optical element 422 defining the cavity 4223 and enters the optical element 422, with most of the light entering the bottom portion 4221 almost 90° with the vertical axis 4220 and emitted through the outer surface 4224 after being refracted by the outer surface 4224. A part of the light which enters the top portion 4222 is reflected by the top surfaces 4225, 4226. The light entering the top portion 4222 experiences total reflection at the top surfaces 4225 and 4226, and is emitted through the vertical sidewalls 4227 and 4228 almost at 90° with the vertical axis 4220.
Therefore, most of the light from the optical element 422 is parallel with the extension axis +X or −X of the road surface 11. Little light deflects from the extension axis of the road surface 11 with a small angle. The included angle between the light from the optical element 422 and the extension axis −X is θ1. The included angle between the light from the optical element 422 and the extension axis +X is θ2.
The vertical sidewall 4227 of the optical element 422 relative to the road surface 11 is shorter than vertical sidewall 4228. Thus, light from the light emitting element 421 passes through the optical element 422, and is then emitted along the road surface 11. The distribution of light is asymmetric at both sides of the light source 42. Thus, the included angles θ1 and θ2 are between the light from the light emitting element 421 passing through the optical element 422 and the road surface 11. θ1 is less than θ2. θ1 and θ2 are within the predetermined range, such as −10°<θ1<+10° and −20°<θ2<+20°. The included angles θ1 and θ2 are between the light from optical element 422 having 50% of the maximum luminous intensity on the plane and the road surface 11.
Referring to
The optical elements 223 and 224 have a symmetrical center axis 2220 parallel with extension axis X of the road surface 11. The extension axis of the road surface 11 is divided into axis +X and axis −X. Also referring to
In this embodiment, the light from the light emitting elements 222 is emitted to the light emitting surfaces 2231 and 2241 of the optical elements 223 and 224, enters the transparent package 25, and refracts at side surface 252 of the illumination apparatus 200, and then is emitted to the extension axis +X or −X of the road surface 11. Therefore, the included angle between the light and the extension axis +X is θ1. The included angle between the light and the extension axis −X is θ2. The included angle between the first surface 2232a and the second surface 2232b of the micro-structure 2232 of the light emitting surface 2231 of the optical element 223 is β1. The included angle between the first surface 2242a and the second surface 2242b of the micro-structure 2242 of the light emitting surface 2241 of the optical element 224 is β2. β1 is less than β2.
Therefore, the angle of the first surface 2232a of the micro-structure 2232 of the light emitting surface 2231 of the optical element 223 exceeds the angle of the first surface 2242a of the micro-structure 2242 of the light emitting surface 2241 of the optical element 224.
The convergence of the light from the optical element 223 which is emitted to the road surface 11 is better than the convergence of the light from the optical element 224. Hence, the light from the light emitting elements 222 passes through the optical element 223 and the transparent package 25 and emits along the road surface 11. The distribution of light field of both sides of the light source 22 is asymmetric. θ1 is less than θ2. The light from illumination apparatus 200 is not emitted directly to the view of oncoming traffic (from left of
In this embodiment, θ1 and θ2 are in the predetermined range. For example, −10°<θ1<+10° and −20°<θ2<+20°. The included angle θ1 and θ2 are between the light from the optical elements 223 and 224 having 50% of the maximum luminous intensity on the plane and the road surface 11.
Referring to
The optical element 523 has a symmetrical center axis 5230 parallel to the extension axis X of the road surface 11. The extension axis of the road surface 11 is divided into −X and +X. The optical element 523 has a light emitting surface 5231 opposite to the light emitting element 522. The light emitting surface 5231 has a plurality of sawtoothed micro-structures 5232, although the micro-structures 5232 are not limited to a sawtoothed configuration, and can be of other shapes, such as a trapezoid sawtoothed protrusion, or other. The micro-structure 5232 distributes light on the light emitting surface 5231 uniformly and provides effect of light homogenization. The light from the light emitting element 522 is largely emitted to the light emitting surface 5231 of the optical element 523, and enters the transparent package 25, and then refracts at the side surface 252 of the illumination apparatus 200, after that the light deflects to the extension axis +X of the road surface 11 and is emitted to the road surface 11. Therefore, the included angle between the light and the extension axis +X of the road surface is θ. θ is in the predetermined range. For example, −20°<θ<+20°. The included angle θ is between the light from optical element 523 having 50% of the maximum luminous intensity on the plane and the road surface 11.
The light emitting element 522 is mounted on the second side surface 5212 of the substrate 521. Therefore, the light from the light source 52 passes through the optical element 523 and forms light field only in the extension axis +X of the road surface 11. Thus, the light does not cause direct glare at the eyes of driver in the car of coming direction (from left of
While certain embodiments have been described and exemplified above, various other embodiments from the foregoing disclosure will be apparent to those skilled in the art. The disclosure is not limited to the particular embodiments described and exemplified but is capable of considerable variation and modification without departure from the scope of the appended claims.
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